/Engine/Source/Runtime/RHI/Public/GPUDefragAllocator.h
Marks the specified chunk as 'allocated' and updates tracking variables. Splits the chunk if only a portion of it is allocated.
The memory chunk that was allocated (the original chunk could've been split).
[FMemoryChunk](API\Runtime\RHI\FGPUDefragAllocator\FMemoryChunk) * AllocateChunk ( [FMemoryChunk](API\Runtime\RHI\FGPUDefragAllocator\FMemoryChunk) * FreeChunk, int64 AllocationSize, bool bAsync, bool bDoValidation )